/**
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.apache.hadoop.zebra.types;

import java.util.List;
import org.apache.pig.data.Tuple;
import org.apache.pig.data.TupleFactory;
import org.apache.pig.backend.executionengine.ExecException;

/**
 * Factory that produces ZebraTuples;
 */
class ZebraTupleFactory extends TupleFactory {
  private static ZebraTupleFactory self = null;
  
  public Tuple newTuple() {
    return new ZebraTuple();
  }   

  public Tuple newTuple(int size) {
    return new ZebraTuple(size);
  }   
  
  @SuppressWarnings("unchecked")
  public Tuple newTuple(List c) {
    return new ZebraTuple(c);
  }   

  @SuppressWarnings("unchecked")
  public Tuple newTupleNoCopy(List list) {
    return new ZebraTuple(list, 1); 
  }   

  public Tuple newTuple(Object datum) {
    Tuple t = new ZebraTuple(1);
    try {
        t.set(0, datum);
    } catch (ExecException e) {
        // The world has come to an end, we just allocated a tuple with one slot
        // but we can't write to that slot.
        throw new RuntimeException("Unable to write to field 0 in newly " + 
            "allocated tuple of size 1!", e); 
    }
    return t;
  }   

  public Class tupleClass() {
    return ZebraTuple.class;
  }   

  ZebraTupleFactory() {
  }
  
  public static ZebraTupleFactory getZebraTupleFactoryInstance() {
    if (self == null) {
      self = new ZebraTupleFactory();
    }
    return self;
  }
}
